Best Humidity Meters UK: Hygrometers & Humidity Monitors
A humidity meter — also called a hygrometer or humidity monitor — shows how much moisture is in the air in a room. In a UK flat, that is the number that decides whether you get condensation on the windows and mould in the corners. It tells you when to open a window, run a dehumidifier or stop drying clothes in that room.
This guide compares six humidity meters, from simple digital displays to smart monitors that log readings and send alerts to your phone. It also covers where to put them, what the readings mean, and when you need a damp meter for the walls instead.
QUICK ANSWER
For most UK flats, a basic digital humidity meter (hygrometer) such as the ThermoPro TP49 is all you need. Put one in each room that gets damp and aim to keep humidity roughly between 40% and 60%. Choose a smart Bluetooth or Wi-Fi monitor if you want history graphs and phone alerts. A humidity meter measures the air — to check whether a wall is damp, you need a moisture meter.
Our top pick: ThermoPro TP49 Digital Hygrometer — best for a simple, cheap humidity readout
Details)
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon.co.uk at the time of purchase will apply to the purchase of this product.Who this guide is for
Anyone in a UK flat dealing with condensation, mould, a musty smell or washing that will not dry, who wants to know how humid their rooms really are. It also suits landlords and anyone managing a rented flat remotely who wants an early warning before damp sets in.
Our picks at a glance
| Pick | Best for |
|---|---|
| ThermoPro TP49 Digital Hygrometer See details ↓ |
A simple, cheap humidity readout for one room |
| ThermoPro TP49 Hygrometer (4-Pack) See details ↓ |
Monitoring bedroom, bathroom, kitchen and living room at once |
| ThermoPro TP53 Hygrometer See details ↓ |
Seeing how high humidity got overnight |
| Govee Bluetooth Hygrometer See details ↓ |
Humidity history and alerts on your phone at home |
| SwitchBot Meter See details ↓ |
Tracking dew point as well as humidity |
| Tapo T315 Smart Hygrometer See details ↓ |
Getting alerts when you are out, or managing a rental |
How we chose
We compared humidity meters sold on Amazon UK on clarity of the display, comfort indicators, min/max memory, app logging and alerts (and whether they need a hub), mounting options, stated accuracy where the maker gives one, and the depth of customer feedback. We have not tested these meters hands-on; the picks are based on published specifications and customer feedback.
Our picks in detail
BEST BASIC — ThermoPro TP49 Digital Hygrometer
Best for: A simple, cheap humidity readout for one room
A small digital humidity meter and thermometer with a clear screen and a smiley-face comfort indicator for dry, comfortable or wet air. It is one of the most-reviewed humidity meters on Amazon UK, and it is cheap enough to put one in each problem room.
Pros: Very cheap, simple to read, small enough to sit on any shelf.
Cons: No history graph or alerts — you have to look at it.
Details)
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon.co.uk at the time of purchase will apply to the purchase of this product.Prices and availability on Amazon are accurate as of the date of publication and are subject to change.
BEST FOR EVERY ROOM — ThermoPro TP49 Hygrometer (4-Pack)
Best for: Monitoring bedroom, bathroom, kitchen and living room at once
Four of the same TP49 humidity meters in one pack, usually for less per unit than buying singles. Damp problems often show up in one room first, typically a bedroom or the bathroom side of the flat, so a meter in each room shows you where to focus.
Pros: Low cost per room, same simple display, easy to compare rooms.
Cons: Still no logging or alerts, and you may not need four in a studio.
Details)
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon.co.uk at the time of purchase will apply to the purchase of this product.Prices and availability on Amazon are accurate as of the date of publication and are subject to change.
BEST WITH MIN/MAX MEMORY — ThermoPro TP53 Hygrometer
Best for: Seeing how high humidity got overnight
A larger-screen humidity meter with a touch backlight and a comfort indicator. It records the maximum and minimum humidity and temperature over the last 24 hours or all time, so you can see the overnight peak in a bedroom without a smartphone app. It can stand, hang or attach by magnet.
Pros: Min/max memory, backlit screen, flexible mounting, well reviewed.
Cons: No app, so no graphs or alerts.
Details)
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon.co.uk at the time of purchase will apply to the purchase of this product.Prices and availability on Amazon are accurate as of the date of publication and are subject to change.
BEST SMART (BLUETOOTH) — Govee Bluetooth Hygrometer
Best for: Humidity history and alerts on your phone at home
Shows humidity and temperature on its screen and logs readings to the Govee app over Bluetooth, so you can see how humidity rises after showers, cooking or drying clothes. App alerts reach your phone when it is within Bluetooth range.
Pros: History graphs, phone alerts, good value for a smart monitor.
Cons: Bluetooth only — no alerts when you are away from home.
Details)
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon.co.uk at the time of purchase will apply to the purchase of this product.Prices and availability on Amazon are accurate as of the date of publication and are subject to change.
BEST BUDGET SMART — SwitchBot Meter
Best for: Tracking dew point as well as humidity
A small smart humidity meter with a stated accuracy of ±2% RH. Its app shows dew point and absolute humidity alongside the usual readings, which helps you judge condensation risk on cold walls and windows. Push notifications need a SwitchBot Hub, sold separately.
Pros: Cheap for a smart sensor, dew point readings, several mounting options.
Cons: Remote alerts need an extra hub, and its reviews are a little lower than the others.
Details)
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon.co.uk at the time of purchase will apply to the purchase of this product.Prices and availability on Amazon are accurate as of the date of publication and are subject to change.
BEST FOR ALERTS AWAY FROM HOME — Tapo T315 Smart Hygrometer
Best for: Getting alerts when you are out, or managing a rental
A smart humidity and temperature sensor with a 2.7-inch e-ink display and real-time app notifications. It stores two years of data free, and it can switch other Tapo devices on or off when humidity crosses a limit you set. It requires a Tapo hub, sold separately.
Pros: Alerts anywhere, long data history, clear e-ink screen, home automation.
Cons: Needs a Tapo hub, so it is the dearest set-up here.
Details)
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon.co.uk at the time of purchase will apply to the purchase of this product.Prices and availability on Amazon are accurate as of the date of publication and are subject to change.
Basic, smart or Wi-Fi: which humidity meter do you need?
- Basic digital (TP49, TP53): shows the current reading and sometimes a min/max. Ideal if you just want to glance at a room and act.
- Bluetooth smart (Govee, SwitchBot): logs readings to an app so you can see patterns, such as humidity spiking every morning after showers. Alerts only reach you when your phone is in range.
- Hub-connected (Tapo T315, or SwitchBot with its hub): sends alerts wherever you are. Useful if you are out all day, travel, or look after a rented flat.
How to read a humidity meter
- 40–60%: the comfortable, healthy range for most homes.
- Above 60% for hours at a time: condensation and mould become more likely, especially on cold outside walls and windows. Ventilate, use extractor fans, or run a dehumidifier.
- Above 70%: act promptly — this is common in bedrooms overnight and in rooms used for drying clothes.
- Below 40%: the air can feel dry, which is less common in UK flats in winter unless the heating is high.
Readings change through the day, so look at the pattern rather than a single number. Our condensation risk calculator shows what humidity level puts your walls and windows at risk.
How to choose
- Display: a large screen or backlight helps if the meter sits across the room.
- Comfort indicator: a smiley or dry, comfortable and wet label makes the reading instant to interpret.
- Min/max memory: shows the overnight peak without an app.
- App and alerts: worth it if you want history graphs or warnings — check whether alerts need a hub.
- Mounting: stand, hook, magnet or adhesive. Choose what suits the room.
- How many rooms: multipacks are the cheapest way to cover the whole flat.
Common questions
What is the best humidity meter for a UK home?
For most flats, a basic digital humidity meter such as the ThermoPro TP49 is the best value. If you want history graphs and phone alerts, the Govee Bluetooth hygrometer is a good step up, and the Tapo T315 (with a Tapo hub) sends alerts when you are out.
What humidity is healthy for a flat?
Around 40–60% relative humidity is a good target. Below that the air can feel dry; above 60% for long periods encourages condensation and mould, so it is a sign to ventilate or run a dehumidifier.
Is a humidity monitor the same as a hygrometer?
Yes. A hygrometer is simply a device that measures humidity, and “humidity meter”, “humidity monitor” and “humidity tester” all mean the same thing. Smart versions add logging and phone alerts on top of the basic reading.
Are cheap humidity meters accurate enough?
For spotting trends and knowing when a room is too damp, yes. They are not lab instruments and two meters side by side may differ by a few per cent, but that is more than accurate enough to guide ventilation and dehumidifier use.
What is the difference between a hygrometer and a moisture meter?
A hygrometer measures humidity in the air; a moisture meter measures how wet a wall, floor or piece of wood is. For damp problems it is often worth having both — see our guide to moisture meters for walls.
Where should I put a humidity meter?
Somewhere representative of the room, at roughly head height, and away from windows, radiators, extractor fans, kettles and the cooker, which would skew the reading. In a bedroom, near the bed or on a chest of drawers works well.
How many humidity meters do I need?
One in each room that tends to get damp — usually the bedroom and the room you dry clothes in. They are cheap, so a multipack is an easy way to watch the whole flat.
Our recommendation
For most people, the ThermoPro TP49 is all you need. Buy the 4-pack if you want every room covered. Choose the ThermoPro TP53 if you want to see the overnight peak, and the Govee Bluetooth hygrometer if you want graphs and alerts at home. If you want alerts when you are out — or you look after a rented flat — go for the Tapo T315 with a Tapo hub.
If the meter shows high humidity, see our guides to dehumidifiers for UK flats and preventing mould in a flat. If you suspect a damp wall rather than damp air, see our moisture meters for walls guide.
